Varallo Sesia, pronunciation commonly known as Varallo, is a comune and town in the province of Vercelli in the Piedmont region of Italy. It is situated in Valsesia, at 450 metres above sea level and some 66 kilometres north-northeast of Vercelli and 55 kilometres northwest of Novara. Once called Varade, it is divided in two boroughs by the Mastallone stream.